Lyell Collection
Journal of the Geological Society
Lyell Centre  |   Lyell Collection  |   Subscriptions   |   Geological Society  |   Email alerts  |   Online bookshop  |   Help

Keywords:
Author:
Advanced search>>
This Article
Right arrow Full Text (PDF)
Right arrow References
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow Request Permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by MUSSETT, A. E.
Right arrow Articles by TAYLOR, G. K.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Journal of the Geological Society; 1994; v. 151; issue.1; p. 79-81;
DOI: 10.1144/gsjgs.151.1.0079
© 1994 Geological Society of London

Article

40Ar-39Ar ages for dykes from the Falkland Islands with implications for the break-up of southern Gondwanaland

A. E. MUSSETT1 & G. K. TAYLOR2

1 Department of Earth Sciences, Liverpool University, Liverpool L69 3BX, UK
2 Department of Geological Sciences, University of Plymouth, Plymouth PL4 8AA

40Ar-39 incremental-heating spectra analyses were made of five microgabbro dykes from the Falkland Islands, two of which yielded an acceptable plateau, and a third a close maximum estimate. All three indicate an age of dyke intrusion of about 190 Ma, supporting a single, published K-Ar date. This provides further support for the geological continuity of the Falkland Islands and the eastern Karoo Basin where dyke swarms of similar petrological affinities were intruded at about the same time. The age constrains the previously published palaeoreconstruction of the Falkland Islands, based on palaeomagnetic data, which places the Falklands immediately to the east of southern Africa, to be valid until at least the late Early Jurassic.




This article has been cited by other articles:


Home page
 Journal of the Geological SocietyHome page
G. S. KIMBELL and P. C. RICHARDS
The three-dimensional lithospheric structure of the Falkland Plateau region based on gravity modelling
Journal of the Geological Society, 2008; 165: 795 - 806.
[Abstract] [Full Text] [PDF]

Home page
 Journal of the Geological SocietyHome page
P. STONE, P.C. RICHARDS, G.S. KIMBELL, R.P. ESSER, and D. REEVES
Cretaceous dykes discovered in the Falkland Islands: implications for regional tectonics in the South Atlantic
Journal of the Geological Society, 2008; 165: 1 - 4.
[Abstract] [Full Text] [PDF]

Home page
 Geological Society, London, Special PublicationsHome page
C. W. Rapela, R. J. Pankhurst, C. M. Fanning, and F. Herve
Pacific subduction coeval with the Karoo mantle plume: the Early Jurasssic Subcordilleran belt of northwestern Patagonia
Geological Society, London, Special Publications, 2005; 246: 217 - 239.
[Abstract] [PDF]

Home page
 GeologyHome page
Weddell triple junction: The principal focus of Ferrar and Karoo magmatism during initial breakup of Gondwana
Geology, 2000; 28: 539 - 542.


Home page
 Journal of the Geological SocietyHome page
P. F. BARKER
Evidence for a volcanic rifted margin and oceanic crustal structure for the Falkland Plateau Basin
Journal of the Geological Society, 1999; 156: 889 - 900.
[Abstract] [PDF]

Home page
 Journal of the Geological SocietyHome page
C. MITCHELL, R. M. ELLAM, and K. G. COX
Mesozoic dolerite dykes of the Falkland Islands: petrology, petrogenesis and implications for geochemical provinciality in Gondwanaland low-Ti basaltic rocks
Journal of the Geological Society, 1999; 156: 901 - 916.
[Abstract] [PDF]

Home page
 Geological Society, London, Special PublicationsHome page
P. F. Barker
Falkland Plateau evolution and a mobile southernmost South America
Geological Society, London, Special Publications, 1999; 153: 403 - 408.
[Abstract] [PDF]

Home page
 Geological Society, London, Special PublicationsHome page
N. S. Meadows
Basin evolution and sedimentary fill in the Palaeozoic sequences of the Falkland Islands
Geological Society, London, Special Publications, 1999; 153: 445 - 464.
[Abstract] [PDF]

Home page
 Journal of the Geological SocietyHome page
M. L. CURTIS and D. M. HYAM
Late Palaeozoic to Mesozoic structural evolution of the Falkland Islands: a displaced segment of the Cape Fold Belt
Journal of the Geological Society, 1998; 155: 115 - 129.
[Abstract] [PDF]

Home page
 Geological Society, London, Special PublicationsHome page
T. S. Brewer, D. Rex, P. G. Guise, and C. J. Hawkesworth
Geochronology of Mesozoic tholeiitic magmatism in Antarctica: implications for the development of the failed Weddell Sea rift system
Geological Society, London, Special Publications, 1996; 108: 45 - 61.
[Abstract] [PDF]

Home page
 Geological Society, London, Special PublicationsHome page
P. C. Richards, R. W. Gatliff, M. F. Quinn, N. G. T. Fannin, and J. P. Williamson
The geological evolution of the Falkland Islands continental shelf
Geological Society, London, Special Publications, 1996; 108: 105 - 128.
[Abstract] [PDF]